CN201369303Y - Electric arc guiding element and breaker - Google Patents

Abstract

The utility model relates to an arc guiding element and an arc extinguishing chamber for a low-voltage molded case circuit breaker. The arc extinguishing chamber includes: an arc guiding element (2) located on the entrance side of the arc extinguishing chamber and through which the movable contact (1) passes; The arc extinguishing grid (3); and the air outlet baffle (10) on the opposite side are used to guide the air circulation in the arc extinguishing chamber. The static contact (9) is arranged at the bottom of the arc extinguishing chamber and can be in contact with or separated from the moving contact.

Description

Arc guiding elements and circuit breakers

technical field

The utility model relates to an arc guiding element for a circuit breaker and the circuit breaker.

Background technique

An important function of the molded case circuit breaker is to break the fault current in the event of a short circuit. Its key function is performed by the interrupter of the circuit breaker. When there is a short-circuit current, the electromagnetic repulsion will repel the moving contacts, and the voltage between the moving and static contacts will cause the air to discharge and form an arc. The short-circuit current is cut off before reaching its peak value.

If there is no good arc guiding element, the arc cannot fully enter, or even enter the arc extinguishing grid, so that the arc voltage cannot be established, and the circuit breaker cannot play the role of breaking, or even be burned.

Utility model content

In order to solve the above problems, one of the purposes of this utility model is to provide an arc guiding element and an arc extinguishing chamber with excellent performance, which can make the arc fully enter the arc extinguishing grid, and ensure that the fault current is broken in the event of a short circuit.

The utility model provides an arc guiding element used in an arc extinguishing chamber of a molded case circuit breaker, comprising: a top plate; a rear plate extending downward from the end of the top plate; a through groove; and left and right inner plates respectively located on the left and right lateral sides of the through groove, connected with the top plate and the rear plate, and extending forward from the rear plate.

The utility model also provides a molded case circuit breaker, a circuit breaker, including an arc extinguishing chamber, characterized in that the arc extinguishing chamber includes: an arc guide located at the entrance side of the arc extinguishing chamber and through which the moving contact passes. an element; a plurality of arc extinguishing grids extending from the opposite side of the arc extinguishing chamber inlet; ; the rear plate extending downward from the end of the top plate close to the entrance of the arc extinguishing chamber; the through groove formed longitudinally through the middle of the top plate and the rear plate; The left and right inner plates extending in the arc extinguishing chamber; and wherein the static contact is located at the bottom of the arc extinguishing chamber, and the moving contact contacts or separates from the static contact through the through slot.

The narrow cavity formed by the top plate and the left and right inner plates around the through groove can guide the arc into the arc extinguishing grid in a predetermined direction, and because the through groove penetrates up and down, it is conducive to the flow of air to reliably realize the breaking operation. The left and right inner plates also have the function of insulation to prevent arcing between the moving contact and the arc extinguishing grid.

The arc guiding element of the utility model has the advantages of simple structure, convenient installation and good reliability.

Description of drawings

Fig. 1 is a schematic sectional view of the molded case circuit breaker of the present invention;

Fig. 2 is a schematic perspective view of an arc extinguishing chamber in the molded case circuit breaker of Fig. 1;

FIG. 3 is a rear view of an arc guiding element in the arc chute of FIG. 2 .

FIG. 4 is a front view of an arc guiding element in the arc chute of FIG. 2 .

5 is a side view and a rear view of an arc guiding element in the arc chute of FIG. 2 .

Detailed ways

The arc extinguishing chamber and the arc guiding element of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic sectional view of the molded case circuit breaker of the present invention. Fig. 2 is a schematic perspective view of an arc extinguishing chamber in the molded case circuit breaker of Fig. 1 .

Molded case circuit breaker mainly includes: wiring part, current loop part, mechanism movement part, thermal protection and magnetic protection part, and arc extinguishing chamber. The above-mentioned various components are the same as those in the prior art, so detailed descriptions of these components are omitted. The following mainly describes the structure of the arc extinguishing chamber of the molded case circuit breaker.

As shown in Figures 1 and 2, the arc extinguishing chamber includes: an arc guiding element 2 located at the inlet side of the arc extinguishing chamber and through which the movable contact 1 passes; extending radially from the inlet side of the arc extinguishing chamber to the opposite side and spaced apart A plurality of arc extinguishing grids 3 arranged; and an air outlet baffle 10 on the opposite side are used to guide air circulation in the arc extinguishing chamber, and an air outlet is arranged on the upper end of the air outlet baffle 10 . The static contact 9 is arranged at the bottom of the arc extinguishing chamber, and can be in contact with or separated from the moving contact 1 . The structure of the arc extinguishing grid is well known to those skilled in the art, so a detailed description thereof is omitted.

The arc guiding element 2 includes: a top plate 8 located at the top of the arc extinguishing chamber; a rear plate 4 extending vertically downward from the end of the top plate 8 close to the entrance side of the arc extinguishing chamber; a power supply formed vertically through the middle of the top plate 8 and the rear plate 4 The through slot 7 through which the contacts move; and the left and right inner plates 5 and 6 respectively located on the left and right lateral sides of the through slot 7, connected with the top plate 8 and the rear plate 4, and extending into the arc extinguishing chamber to cover the separation discharge area of the moving and static contacts.

The through groove 7 divides the back plate 4 into two parts, left and right.

The transverse width of the through groove 7 is slightly larger than that of the movable contact, so as not to hinder the movement of the movable contact.

In addition, the top plate 8, the left and right inner plates 5 and 6 form a narrow cavity around the through slot 7, which is convenient for guiding the arc movement.

The arc guiding element 2 has a width equal to the width of the arc extinguishing chamber, so as to cover the entrance of the arc extinguishing chamber and prevent metal particles from escaping due to gasification during breaking. The arc guiding element 2 is made of thermosetting plastic with good insulating properties.

In the case of normal connection, the arc extinguishing structure of the arc extinguishing chamber does not work. When it is normally connected, the moving contact 1 and the static contact 9 contact and conduct current.

When there is a short-circuit current, the electromagnetic repulsion force will repel the moving contact 1 which is in contact with the static contact 9, and the voltage between the moving and static contacts will cause air discharge and form an arc. Under the action of electrodynamic repulsion and air flow, the arc fully enters the arc extinguishing grid 3 through the narrow cavity formed by the top plate 8 and the left and right inner plates 5 and 6 around the through slot 7, and is broken until extinguished. As a result, the short-circuit current is cut off before reaching its peak value.

The narrow cavity formed by the top plate 8, the left and right inner plates 5 and 6 around the through slot 7 can guide the arc into the arc extinguishing grid in a predetermined direction, and because the through slot 7 penetrates up and down, it is conducive to the flow of air.

In addition, the left and right inner plates 5 and 6 also have an insulating function to prevent electric arcs between the moving contacts and the arc extinguishing grids.

This component can be directly inserted into the arc extinguishing chamber during installation, which is easy to operate.

The arc guiding element of the present invention can also be used in other types of circuit breakers other than molded case circuit breakers for arc extinguishing operation.

Although the present utility model has been described with reference to the above-mentioned embodiments, those skilled in the art can understand that various variations or modifications can be made to the above-mentioned embodiments within the spirit of the present utility model.

Claims (9)

1. An arc guiding element used in an arc extinguishing chamber of a circuit breaker, characterized in that the arc guiding element comprises: roof; a rear panel extending downwardly from the end of the top panel; a through groove formed longitudinally through the middle of the top plate and the rear plate; and The left and right inner panels are respectively located on the left and right lateral sides of the through groove, are connected with the top panel and the rear panel, and extend forward from the rear panel. 2. The arc guiding element of claim 1, wherein the arc guiding element has a width equal to the width of the arc chute. 3 . The arc guiding element according to claim 1 , wherein the top plate and the left and right inner plates form a narrow cavity around the through groove to form a contact separation discharge area. 4 . 4. The arc guiding element of claim 1, wherein the top and bottom plates integrally form an arc. 5. A circuit breaker, comprising an arc extinguishing chamber, characterized in that the arc extinguishing chamber comprises: The arc guiding element located on the inlet side of the arc chute and through which the moving contact passes; a plurality of arc extinguishing grids extending from the opposite side of the entrance of the arc extinguishing chamber; The outlet baffle on the opposite side, Wherein, the arc guiding element comprises: The top plate at the top of the interrupter; a rear plate extending downward from the end of the top plate near the inlet side of the interrupter; a through groove formed longitudinally through the middle of the top plate and the rear plate; and the left and right inner plates respectively located on the left and right lateral sides of the through slot, connected with the top plate and the rear plate and extending into the arc extinguishing chamber; and Wherein, the static contact is located at the bottom of the arc extinguishing chamber, and the movable contact contacts or separates from the static contact through the through slot. 6. The circuit breaker of claim 5, wherein the arc guiding element has a width equal to the width of the arc chute. 7 . The circuit breaker according to claim 5 , wherein the top plate and the left and right inner plates form a narrow cavity around the through groove to form a contact separation discharge area. 8 . 8. The circuit breaker according to claim 5, wherein the plurality of arc extinguishing grids extend radially and are arranged at intervals. 9. The circuit breaker according to claim 5, wherein the top plate and the bottom plate form an arc as a whole.

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